Datasheet
Table Of Contents
- Features
- Applications
- Description
- Absolute Maximum Ratings
- Operating Ratings
- Electrical Characteristics
- I2C Interface
- Timing Characteristics
- Timing Diagram
- Typical Performance Characteristics
- Function Description
- Application Information
- Revision History
DGND CE1 14
REMENB
SCL WE
VREF
SDA
NC C1
C2VDD
7 8AGND VOUT
DAP
I2C INTERFACE
AND
CONTROL
REGISTERS
RE
VREF
VDD
AGND
CE
WE
VOUT
C1
SCL
TEMP
SENSOR
VREF
DIVIDER
C2
SDA
R
Load
VARIABLE
BIAS
MENB
DGND
A1
+
-
TIA
+
-
R
TIA
CE
WE
RE
3-Lead
Electrochemical
Cell
CONTROLLER
LMP91000
LMP91000
SNAS506H –JANUARY 2011–REVISED MARCH 2013
www.ti.com
Typical Application
Figure 1. AFE Gas Detector
Connection Diagram
Figure 2. 14–Pin WSON — Top View
PIN DESCRIPTIONS
Name Pin Description
DGND 1 Connect to ground
MENB 2 Module Enable, Active Low
SCL 3 Clock signal for I
2
C compatible interface
SDA 4 Data for I
2
C compatible interface
NC 5 Not Internally Connected
VDD 6 Supply Voltage
AGND 7 Ground
VOUT 8 Analog Output
C2 9 External filter connector (Filter between C1 and C2)
C1 10 External filter connector (Filter between C1 and C2)
VREF 11 Voltage Reference input
WE 12 Working Electrode. Output to drive the Working Electrode of the chemical sensor
RE 13 Reference Electrode. Input to drive Counter Electrode of the chemical sensor
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